AD7656中文datasheet

250kSPS、六通道、同步采样、双极性16/14/12-位ADCAD7656/AD7657/AD7658Rev.DInformationfurnishedbyAnalogDevicesisbelievedtobeaccurateandreliable.However,noresponsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorotherrightsofthirdpartiesthatmayresultfromitsuse.Specicationssubjecttochangewithoutnotice.NolicenseisgrantedbyimplicationorotherwiseunderanypatentorpatentrightsofAnalogDevices.Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.OneTechnologyWay,P.O.Box9106,Norwood,MA02062-9106,U.S.A.Tel:[phone]AnalogDevices,Inc.Allrightsreserved.功能框图VSSDGNDVDDREFCONVSTACONVSTBCONVSTCOUTPUTDRIVERSOUTPUTDRIVERSOUTPUTDRIVERSOUTPUTDRIVERSCONTROLLOGICBUFBUFBUFAGNDT/HT/HT/HT/HT/HT/HCLKOSCAVCCDVCCV1V2V3V4V5V6SER/PARCSVDRIVESTBYDOUTADOUTBDOUTCSCLKRDWRDATA/CONTROLLINES05020-001AD7656/AD7657/AD765816-/14-/12-BITSAR16-/14-/12-BITSAR16-/14-/12-BITSAR16-/14-/12-BITSAR16-/14-/12-BITSAR16-/14-/12-BITSAR图1.-1受美国专利第6,731,232号保护。.特性6个独立ADC真双极性模拟输入引脚/软件可选范围：±10V、±5V高吞吐速率：250kSPSiCMOS工艺技术低功耗140mW(250kSPS，5V电源)宽输入带宽信噪比(SNR)：86.5dB(50kHz输入频率)片内基准电压源及缓冲器并行、串行和菊花链接口模式高速串行接口SPI-/QSPI™-/MICROWIRE™-/DSP兼容待机模式：100μW(最大值)64引脚LQFP封装应用电源线路监控系统仪表和控制系统多轴定位系统概述AD7656/AD7657/AD76581均内置六个16/14/12-bit、快速、低功耗逐次逼近型ADC，并集成到一个封装中，采用iCMOS™工艺(工业级CMOS)设计。iCMOS是一种将高压硅与亚微米CMOS及互补双极性技术相结合的工艺。通过这种工艺，可开发在33V高压下工作的高性能模拟IC，其体积性能比是以往的高压器件所无法实现的。与采用传统CMOS工艺的模拟IC不同，iCMOS元件不但可以输入双极性信号，同时还能提升性能，大幅降低功耗并减小封装尺寸。三款器件的吞吐速率高达250kSPS，并且内置低噪声、宽带宽采样保持放大器，可处理最高12MHz的输入频率。转换过程与数据采集利用CONVST信号和内部振荡器进行控制。三个CONVST引脚允许三对ADC独立地进行同步采样。AD7656/AD7657/AD7658均具有一个高速并行接口和一个高速串行接口，为器件与微处理器或DSP的接口连接创造了条件。在串行接口模式下，这些器件都允许多个ADC以菊花链形式连接至单个串行接口。三款器件均可在±4×VREF和±2×VREF范围内支持真双极性输入信号。此外还内置一个2.5V片内基准电压源。产品特色1.片上集成6个16/14/12-bit250kSPSADC。2.6个真双极性、高阻抗模拟输入。3.并行和高速串行接口。ADI中文版数据手册是英文版数据手册的译文，敬请谅解翻译中可能存在的语言组织或翻译错误，ADI不对翻译中存在的差异或由此产生的错误负责。如需确认任何词语的准确性，请参考ADI提供的最新英文版数据手册。Rev.D|Page2of32AD7656/AD7657/AD7658目录特性..................................................................................................1应用..................................................................................................1功能框图.........................................................................................1概述..................................................................................................1产品特色.........................................................................................1修订历史.........................................................................................2技术规格.........................................................................................3AD7656.......................................................................................3AD7657.......................................................................................5AD7658.......................................................................................7时序规格....................................................................................9绝对最大额定值..........................................................................10热阻..........................................................................................10ESD警告...................................................................................10引脚配置和功能描述.................................................................11典型性能参数...............................................................................14术语................................................................................................18工作原理.......................................................................................20转换器详解.............................................................................20ADC传递函数.........................................................................21基准电压源部分.....................................................................21典型连接图.............................................................................21驱动模拟输入.........................................................................22接口部分..................................................................................22应用须知.......................................................................................29布局...........................................................................................29电源配置...................................................................................29外形尺寸.......................................................................................30订购指南..................................................................................30修订历史2012年3月—修订版C至修订版D更改图26........................................................................................222010年8月—修订版B至修订版C更改表4中的t1单位.......................................................................9更改表5中的VDD至AVCC额定值...............................................10增加“电源配置”部分..................................................................29增加图36.......................................................................................29VDD至AVCC2010年1